<div class="sidebar material-sidebar">
  
    <!-- toggle link for responsive version -->
    <span class="sidebar-toggle">
        <i class="fa fa-plus"></i>
    </span>
    
    {% include header.html %}
    
    <div class="widget">
        <h3 class="title">Categories</h3>
        {% include category_list.html %}
    </div>
    <div class="widget">
        <h3 class="title">Tags</h3>
        {% include tag_list.html %}
    </div>

    <div class="widget">
        <h3 class="title">Authors</h3>
        {% include author_list.html %}
    </div>
    
</div>